Is it safe to delete data from RU tables?

[spark2]

I have web application that uses activiti for running some workflows.
After stopping app server, is it safe to remove all pending data from RU table?

[martin_grofcik]

Hi,

In general: RU tables store data about long running processes. They should persist web app restart. In case when you want to delete all processes you can remove them.

What does it mean "pending data" from your point of view?

Regards
Martin